World Champion ACER Racing 10x15mm Ceramic Ball Bearings 5 pack.  These are 10x15x4mm ceramic ball bearings also known as a size 6700 bearing. HSR inner cage technology for constant performance at high speeds.  Sealed on both sides for superior protection against the elements.  Lightweight and diamond polished ceramic balls for super fast, super smooth action.  Oiled with lightweight 100% synthetic SIN oil.

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